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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e00349fcca921955076d77639777ba7f80656da09deca966e6ecea8082c1e0' 
  AND token = '8m2vjhVd/pqBNNRtizTSaVqDVU+5hjhkAUjeib0SnCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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