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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eecaaec98bd176b620b3fe353d84e17d5250bd20332373d01bb745f726a0cc5' 
  AND token = '+njWg/yOm/FgQ/KTFX44K7dW6BLKW4KJWyQuceZMJFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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