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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7876d5435e596a3d615ee7faece998d9ab79cc6da57effe799a20ecf9b1a0b' 
  AND token = 'HV3pZRKf9TuCdyEzLwHFAqQegIPtWSJKUPzk4wKscio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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