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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468dd7ccd538da1c2c3e7b4755c63c36828a4aa8a244e0d2e400c637b3d58cbd' 
  AND token = 'zlL0Q6Pyv4v7w83MDW5gpabBSu23FMp9RGe2Bb7aHpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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