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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651facf898d90be053ac3af6fa9a5115f60b19448863adb26be2160ca00c7857' 
  AND token = 'nzUa9D56O1QcJ/JD44oelA0GN/96lMsK2M58GhK0nBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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