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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2823b48e4e8fe8855f80cd5bb70f1626aa68c5ada8a9417d347c30494bd3268' 
  AND token = 'gvU143gkii72MVQV4bUJd6XR9m/ZBrB83cn8D6crwxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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