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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec02e386153eb55ef88084b99572e5b9e350adfc767b4cc3cfd8300c81c0012' 
  AND token = 'Rc3IoGHpSPhd/o2W2iMVsvpbeESC4q02KukcHpZ/j+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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