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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e5bcae49e89270292ffb1850e9c9b10e3aea9311264f28eb35f3f36d54cbfd' 
  AND token = '3PpM+QzG8p1gtQElzr1wCCRo/eLN2sE29Nj86Yppp70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}