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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c25ccf07877c15b881d0b139931e2a0e086110ce6c42285443b1478a1484d0' 
  AND token = 'cqWkNf/ZlogALetvlBaBOrKSoW8Cd7R5vH5zNbDwQhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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