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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1d5ceae61f946457f923fcfb76142705a4c86f96e106dd6a4628e7554511bc' 
  AND token = 'MOUTw4K86EQL1GiG/jAiJUwFsS9VYx6TUf7VKQ6eiTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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