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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9314d08e180305799b23896a387f40f20a1095e4c28d0cb3da97fdd44aa451' 
  AND token = 'IiZNmI4XrwcEeMF/x9alMiOOj2pGi6YqD66pRUGob4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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