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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826b04e53b052d74a7f4a4509a9c68444db2a4df206062a11494db50a1c1d5ad' 
  AND token = 'TLPF5IkTxPSs0dSuwfitiSm9xs/VglhuXGhbE6frk8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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