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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed46e8e21786428751396d2d472cf816180c5e07dde98ad82fa2c58eee3534d' 
  AND token = 'Jz7Q366KPZd7gCWfzTG1lF6lC2/vy1j+0UPW408528k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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