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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf81e3e8f2b72d3a00f7945d1e1f8573db911f1f0516803e1b574bfa1b7943b' 
  AND token = 'Rew/dPM48QTRCSUrRfTMPQK8+qd+vXp1mFLXN7dJjd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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