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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944f9f18ac31902079d09e67c1861bab202a9065416d6aed97a1e1d1ab045860' 
  AND token = 'keuEv0rgeFltBoWu57rHXV/ipaf5JHcNvevvGe0IeSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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