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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5611e689002b6fa47d8027c615e1f2c6bec3bf915df7d98cc4dfa6d85d1913' 
  AND token = 'AP6CucWzuyxGpumHzlDPN/07eFaL1e2sXY3juZ70YOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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