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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383bb4b3d765e39f009dbc5906d6e17ff94b8546c8b162b9c75c1f4a38ecd8f5' 
  AND token = '+9nsBkw9lruOY7tyLGDot6A3tEM6QhjnsjhOwx9sn+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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