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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97352a9227d27f4895d2c2e3cd6c2b6e84ea38f219d9bfa37e28b3167135b0aa' 
  AND token = 'BUSs38uqikC5/UKml6lsOWSwCWWHBICWz1j3sQ/5yEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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