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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf194b6885d0345e1c50cf21f3c810e3dc221d6c8c0fd5386ecbb6453bdf4ca9' 
  AND token = 'PzJhHadX0zUGZuNnOm3gSTd3CRWW5sIsnbI0X3pkDyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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