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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3ecff90413545ff469fbba1994ddd1b60c4da5fc2e04c0ffe2686fd0ffd9d8' 
  AND token = 'eoHj/CFHVPrzVU5gjT+DIrjIbtM/eZ2ZRa8KRd/o7C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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