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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ddbce1c14e6f789e0ea116c857f63a1e9ea01191bc5c6ef444b4e4c6200f29' 
  AND token = 'UEoHaQZOCR+tTzXhvGez8zhO1HajxDiuQprySN0P/Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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