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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd761c28fc8389403a244f7eb0004430ecdd6c326f0421fdf0f61722705dacc24' 
  AND token = '/k0Hq5nNaa1k99I3ju+WBVq8yBC5IVhugu3s/aRTVlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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