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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d62a4ace0ca2459f1fe22cee00fe8997e4b0570f332be3190673467115e222d' 
  AND token = '++gaYAaOARsWWO7XX0x5hPXGwXNQh7EFhukd63auN68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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