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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ddfa8870db3b566f7646ae84afc9fc8c7d94d0c409e8a43444fe70cbb32479' 
  AND token = 'mnvt93uW7BQF5P0ycb2UP8ywaIgKUdHufRjNrFlyJ2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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