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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b435e63d0d45088bea54a77ddef030882412abf6e928d2f13b8c04734ad56d81' 
  AND token = '6dWWhUQyZp5By12YpZkBRRtwYmAXOa7DYDd+/CodqKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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