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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900d0889cc2acdb77184eda73f803527f414cc6fd674f5efed1cd5915ca58c9d' 
  AND token = 'ZMoO1q8xRJVFCbJKU222Kg7ZR3Q730yPSN5Zt+3mJqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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