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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04cf876da9e8f93583e10c615a6208930fe125c8423f426f239df602aa0f34c' 
  AND token = '0JXUQxs7vDxGL/FRyFGy9opwYqH3RYOWzo3lMEaRCtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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