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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7db0f6edea3db29dd52a4fb58c36a9a11de002009a5f408379e4d9b6cbd3a4f' 
  AND token = 'fxIsElxwpNVpAesNWfupqJgD7EM9hN6o4UDd52a1oKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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