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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1470de56cc427b2edabfd69c4330d4afd3b63ec8d444f2962054dcd0127ff37' 
  AND token = 'XJOBQIab5KKJadczCMzkgvQfeVw8aAhDQbZ84NXfpZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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