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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94447510b714d2121c47a1ccb53e757cb0ddafc9bbdb2c21c5a55c96d5d5bcfa' 
  AND token = 'CBPmA1OKbdeE+Z0XML2l4iPFMBcnQ+KQeFxHAFnpyK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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