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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6579458e9847c358e93e65b6496595eb606640dccd97033252625f8cb3e98e98' 
  AND token = 'VAXDf3f40EEITr8LFNB29m0KwkfnLbNqkdTY6yT3+m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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