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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab53eacc10e453b7505b59401ea37260cafc795fa7eda24999219817a08aab55' 
  AND token = 'kz7PgpXGedOfSGkXCN243BKXXPIHX2Acw+1K0L8J67Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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