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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3d7497e760cb782052ef13fe73054f1c5de90175eec53913394683e7c5e7b1' 
  AND token = 'PBrcrnZmiam6ewJ5Y2USc6iWN4YcBgKlV8M9P7qtvOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00175

JSON explain

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