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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64e9cd7288ac17f3899bc51e50c317a5ae414912222602a59f2b3d538fa1235' 
  AND token = 'VZmeTuHW8omhI/iBNgue3PnY0rK45rz4acNPKw9mm4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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