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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a292e1ca483706d6327cc4811f3d59e8a30f8c1778cd8ff4266c72ccd80fbb81' 
  AND token = '7GhHsqiyJcKZ5aMesgu/NtzfgfoqBR7jyY9Nh1hy8GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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