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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1780ce08ff953b8a20c3419971d893d1c7a9bbe5313482dc58bca9a9d8e427' 
  AND token = '4qmT8jejLwmdz2aHHupotKgRjoH8V1S5gp9n5OWCONg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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