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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e168186a24c330a188067b8be094d6a208f8cceb3b17544263202f12ac5edbda' 
  AND token = '0jMhIKw+Cc1X6X5e3hfGlLQaR9lI76kaXdQkh0G/wd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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