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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9ba7f430717ed4a891ee9fc19d99fc4861cc13924eeeae9b16352fb1d21f5c' 
  AND token = '4QPZA39zw2G8gT3qh+Bwd+rwqoyzAMY+s2w1goYs/B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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