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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c410d2821a72f90a6ac642a097e1a2b6a41db98205fde4e9f9a5f7388238909' 
  AND token = 'gQrLjywofGRKk/m/eTAB/pB1TxABR/arxv5EpV0wv+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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