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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57cf84204043456ce909699a25a5878f6e190794bfbe12b820c364a40deba13' 
  AND token = 'GfpRNnLStJTMye+s9P+YaTfj3UJlmnuDtX/Km0suZiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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