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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c883d0a7a8f5f45c19172e090c03407ffd9b086f110804a699723a3694d6937' 
  AND token = 'ksDzLLq4rAUx5Uj/jqU/cDh5h4S2I624Uic7N5ydAMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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