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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa339c1e48c2d33ac36efb5c15cf4e56e77b75808420359f4b000c08f9e3b839' 
  AND token = '+Lo6p3D0SehmHXNSXePkUp07SSi5t2WMscJ+9Ycg9zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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