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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842b05b334936eb097c2853ff0487535e4bc83a34fd47e54e9b1a79afe2f25b7' 
  AND token = 'RBbRxO5/1Vx7nEEQIX2iMJSVQWqBO3tlN2YVtdvnV48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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