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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b212c2c51e140ac44c51bb569a16f3afbabf8e80145c9f4821b250f911e2be2a' 
  AND token = 'evKNhOBiCezgtL78AY3QYZQ/8TL23nNCZt8CIpDi/Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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