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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7dacf577d841ae4e01ca8f90e134fe6c161784fdfd6c4fc1fa2b7dc3b9d1ba' 
  AND token = 'wvpcLXo3pzGHbbobMEhspmG9tfUqrF0cn4sGPtWkhCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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