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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956f95bb52c334e28ece3cb96ab30217d55d90db16be9dfd5147660340da1bd3' 
  AND token = 'z4VrUX0zAKtAPw65FpVHFaMEgk0iAqbK4j/JPTvSoh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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