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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68c193c5ec690eea4de72be31fd6920c39d954828be43f26b7b43d1c26e0514' 
  AND token = 'wdDnhnmuaI6AI2jiYoSbqSS4JWOIhRO1dip3HPSTpsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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