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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd347b88f2be6a3b22210cc3045044cd4fc414abd0e11976cabc4e24d335bff' 
  AND token = 'u5SYDwrnP6DZ3oZHI/Q0bYyFYkqdZS1EkRZQLiA/AUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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