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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075265ea396604297985aa6b4938234b2772fcd263a79736d8bc7da2c7da9396' 
  AND token = 'z7vZWP3th9h9tZB/R+L1x3G7UNdSpgbTJgrBByH5kGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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