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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b9a71e7c78d630b81fb1b37bcedd513ae10671ef961d72c61aac8306b6737c' 
  AND token = '+1YKt/4BKoxDnCzIFrmHZDv77PThUR0uPThEgZuVeIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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