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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9562546bdc073e83b89f38137f0de73c169b66f6da4206f3ada23eee54de7445' 
  AND token = 'C8bFCWlgcp1l/WqO/6zfq296OI+qd2WBBKU9f9NPuQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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