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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196d1bdae0972ed7f1b016ffef7ccf4038d94487b1a7ca17e50885ebb3c65c13' 
  AND token = 'hkILLbbo9yNzwKbTGffIsl1DO0cU3CU8V9dUa8qumCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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