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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd38e4a5763fcc8ac4097e3904e1b398f4da61f18903f19c8269f947bd7cee03' 
  AND token = '6BmfydDhvvwXOHenChbTntzxhhTFZmU2iIBbcjgSG1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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