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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef75ccbb4f3d6a975925e068f54d73e1c9bb9f4b440a796b85cf0cddd3fb82c' 
  AND token = 'wdOA3MW7AY3yldtqNTpreauGGYncSC4ewbIaONY+kC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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