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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234b969c5ae689d2c64bab6ee6dae70df2db4b444ec706e5bdf9afb0e0228b0e' 
  AND token = 'iN5YEaH31wWQ5KByUdkaEuvHOUPuzfYlaZPSibBDu7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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